Phrase used by the inarticulate and dimwitted as a comma and to buy time and cover their lack of knowledge of a subject on which they have decided to speak and the resulting insecurity this engenders.

It is particularly irritating in sportspeople, presenters and commentators as they are paid way in excess of the average salary of their audience precisley to tell them what it is they mean. The unspoken assumption is that the audience are already well aware of the 'gem of wisdom' or 'fact' (or see cliche) imparted by the 'expert' and that there really is no need to pay him or her £5000 an episode to provide such insightless insights.

something a girl will say in the middle of sentences with a little squint and head cock to register that you agree with her, but without waiting to see if you actually do (know what she means, or agree) before continuing on with what she was talking about.

Can be abbreviated to "you know" if she is in a hurry to get to a lot of important information.

further abbreviation while texting is commonly seen as "u no?" this version eliminates entirely the need or possibility for instant approval (real or imagined), requiring the textee to actually respond, or risk insulting her by not automatically taking her side.

She: "So I was talking to my friend today about how my dogs were barking at the neighbors when they walked around their backyard and how they like, were just barking, you know what I mean, and the neighbors were like, could you please tell you dogs to stop barking, and i was like, really? you know what i mean? like, they're asking me to keep my dogs quiet while they walk by my house? Really, that's so rude. You know what i mean?"
I: O_O

a phrase often appended to (generally teenaged) girls' run-on sentences, who are emptily seeking affirmation to what they just said. to you guys who are confronted with this situation, just smile and nod.